_process_bank_statement_oe commits after each statement. Under tests this
left the test transaction. Skip the commit when the registry is in test
mode or the current thread is a test thread.
The xpath result was indexed before the emptiness check, so a statement
without IBAN or other account id raised an IndexError instead of the
"No bank account number found." notification.
The error was noted but processing went on with root.nsmap, raising an
AttributeError. Unparseable content now also yields the "Invalid XML
file." notification instead of an XMLSyntaxError.
Jérémy Didderen